[tools/perf] Delete unused variable

tools/perf/measurements/task_execution_time.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from telemetry.page import page_test
 from telemetry.timeline.model import TimelineModel
 from telemetry.timeline import tracing_config
 from telemetry.util import statistics
 from telemetry.value import scalar
 
@@ skipping 23 matching lines @@
                  'v8',
                  'webkit.console']
 
   def __init__(self):
     super(TaskExecutionTime, self).__init__()
     self._renderer_process = None
     self._browser_process = None
     self._results = None
 
   def WillNavigateToPage(self, page, tab):
+    del page  # unused
     config = tracing_config.TracingConfig()
     for category in self._CATEGORIES:
       config.tracing_category_filter.AddIncludedCategory(category)
     config.enable_chrome_trace = True
 
     tab.browser.platform.tracing_controller.StartTracing(
         config, self._TIME_OUT_IN_SECONDS)
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    del page  # unused
     trace_data = tab.browser.platform.tracing_controller.StopTracing()
     timeline_model = TimelineModel(trace_data)
 
     self._renderer_process = timeline_model.GetRendererProcessFromTabId(tab.id)
     self._browser_process = timeline_model.browser_process
     self._AddResults(results)
 
   def _AddResults(self, results):
     self._results = results
 
@@ skipping 153 matching lines @@
   def AddTask(self, name, duration):
     if name in self.tasks:
       # section_tasks already contains an entry for this (e.g. from an earlier
       # slice), add the new duration so we can calculate a median value later.
       self.tasks[name].Update(duration)
     else:
       # This is a new task so create a new entry for it.
       self.tasks[name] = NameAndDurations(name, duration)
     # Accumulate total duration for all tasks in this section.
     self.total_duration += duration